In most of the cases where companies have sold tower sites to VB, it's the entire site, not just the towers themselves. Most of the iHeart-owned AM sites now belong to VB, towers and buildings.
VB maintains the sites (often not very well) and leases them back to the seller. In this case, VB would have taken over the lease arrangement with the agency that owns the land as well.
If there's someone out there with a serious interest in the 560 license, they know how to reach Mary Berner and make an offer. And if for some reason they don't, it's not hard to find a station broker to make the approach.
If 560 ends up being shut down, that's all the evidence needed that no such offer emerged (just as it didn't for WFAS, etc.)
AM is dying very rapidly now. It's very, very hard to justify making any investment in doing anything new on the band. That goes triple for trying to revive a dead frequency. Even if there's an auction and you can get, say, 1230 in White Plains or 720 in Vegas or any other AM that's gone dark, then what?
You have a license that you've just bought at auction for a non-zero sum. Now you need to spend well into seven figures to find a site, put up towers, hire one of the few firms that still knows how to license and build AMs, and congratulations - you've spent maybe a million and a half, maybe more, for a station that has no translator, no listener base, no revenue, and might be worth a few hundred thousand dollars if you can find someone to take it off your hands.
Would you invest in that if it were your money? I sure wouldn't.